Probe, measuring system and method for applying a probe

ABSTRACT

The present invention relates to an improved probe for precisely positioning a probe tip at a measurement point. For this purpose, an image capturing device such as a camera may be firmly arranged at the probe. The image capturing device may capture image data around an area of the probe tip. The captured image data may be provided to a user during positioning the probe tip at the desired measuring point.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to European Patent Application No.19153594.7, filed on Jan. 24, 2019, the content of which is herebyincorporated by reference in its entirety.

TECHNICAL FIELD

The present invention relates to a probe for measuring a signal at ameasuring point, a measuring system with a probe and a method forapplying a probe at a measuring point.

BACKGROUND

Although applicable in principle to any measuring system, the presentinvention and its underlying problem will be hereinafter described incombination with measuring a signal of a device under test.

Due to the continuous miniaturization of electronic devices, theelectronic circuits of the devices also become smaller and smaller. As aconsequence, it becomes more and more difficult to get access to ameasuring point for measuring a signal of the electronic circuit.

In particular, due to the miniaturization of the electronic circuits itis very difficult or almost impossible to precisely position a probe tipon a desired measurement point for measuring an electronic signal at themeasuring point.

For monitoring the quality of devices or for repairing purposes it isnecessary to measure the signals at specific measuring points. However,additional magnifying glasses or microscopes are cumbersome and requirea complicated handling.

SUMMARY

Against this background, there is the need to provide a probe tip whichcan be precisely located at a desired measuring point. In particular,the present invention aims to provide an improved probe which can assista user when positioning the probe tip on a measuring point of anelectronic circuit.

The present invention provides a probe tip, a measuring system and amethod for applying a probe having the features of the independentclaims. Further advantageous embodiments are subject-matter of thedependent claims.

According to a first aspect, a probe for measuring a signal at ameasuring point is provided. The probe comprises a probe tip, an imagecapturing device and an image transmission interface. The probe tip isadapted to contact a measuring point for measuring a signal. The imagecapturing device is adapted to capture image data of an area around theprobe tip. The image transmission interface is adapted to transmit thecaptured image data to a remote measuring apparatus.

According to a further aspect, a measuring system is provided. Themeasuring system comprises a probe according to the first aspect and ameasuring apparatus. The measuring apparatus comprises an imagereceiving interface. The image receiving interface is adapted to receiveimage data transmitted by the image transmission interface of the probe.

According to still a further aspect a method for applying a probe at ameasuring point is provided. The method comprises capturing image dataof an area around a probe tip of a probe. The image data may be capturedby an image capturing device arranged at the probe. The method furthercomprises transmitting the captured image data to a remote measuringapparatus. The transmission of the captured image data may be performedby an image transmission interface of the probe.

The present invention is based on the considerations that preciselypositioning a probe tip on a desired measuring point becomes more andmore difficult with a reduced size of electronic circuits. At the onehand-side, the individual measuring points become smaller, and on theother hand-side, individual measuring points are very close together.Accordingly, a user needs additional support for precisely positioning aprobe tip on a measuring point.

Thus, it is an idea of the present invention to assist a user whenpositioning a probe tip on a desired measuring point by additional imagedata of the environment of a probe tip. For this purpose, an imagecapturing device such as a camera is mounted on the probe carrying theprobe tip. By combining the image capturing device and the probe tip ona probe, the image capturing device can always capture image data of anarea of interest, i.e. the area surrounding the probe tip. Accordingly,the captured image data can be provided to a user and the user canmonitor the positioning process without the need of any separatedevices. In particular, the user does not need to move and control anyother external devices such as magnifying glasses or the like.

Accordingly, the probe for measuring a signal according to the presentinvention comprises both, a probe tip and an image capturing device incombination. Thus, the image capturing device moves around in the samedirection as the probe tip, and consequently, the image data captured bythe image capturing device always provide image data of an area ofinterest.

The captured image data may be provided by an image transmissioninterface, which is also included in the probe. The image transmissioninterface may provide the image data captured by the image capturingdevice in any appropriate manner. For example, the images captured bythe image capturing device may be provided by an analogue signal and insuch a case, the analogue signal may be provided by an imagetransmission interface. However, it is also possible to provide theimage data of the images captured by the image capturing device indigital form. For this purpose, any protocol may be possible.

The image transmission interface may forward the image data of the imagecapturing device to any appropriate device for displaying the imagedata. Some examples for providing the image data in an appropriatemanner will be described in more detail below.

Further embodiments of the present invention are subject of the furthersub-claims and of the following description referring to the drawings.

In a possible embodiment, the image capturing device may comprise a monocamera, a dual camera or a stereo camera.

A mono camera may capture images from a single point of view, i.e. afixed position with respect to the probe. A dual camera may comprise twoseparate optical systems for capturing image data. For example, eachoptical system may have different properties such as opening angle,depth of focus, color characteristics, etc. In particular, theindividual camera elements of the dual camera may be directed even todifferent target points. A stereo camera may capture two almost similarimages from different points of view. In this way, it may be possible toobtain three-dimensional information of the captured field of view.However, it is understood that any other appropriate camera system withone or more camera elements may be possible. It may be possible tocapture image data of a visible spectrum or even of invisible spectrum,for example infrared or ultraviolet light.

In a possible embodiment, the image capturing device is configured tocapture wide-angle images and zoom images.

For example, separate camera elements may be used for simultaneouslycapturing wide-angle images and zoom images. Alternatively, the imagecapturing device may be configured to switch between a first mode forcapturing wide-angle images and a second mode for capturing zoom images.Furthermore, the zooming and opening angle may be changed dynamically.

In a possible embodiment, the image capturing device is adapted toprovide still images and/or an image sequence.

For example, the image capturing device may provide only an individualimage upon request. Alternatively, it may be possible to provide acontinuous stream of images captured with a predetermined frame rate.Accordingly, a user can easily recognize the movement of the probe tipon the electric circuit.

In a possible embodiment, the probe comprises a switch. The switch maybe adapted to switch between an image capturing mode and a signalmeasuring mode.

By alternatively switching between an image capturing mode and a signalmeasuring mode, it may be even possible to provide the image data and ameasuring signal via a same signal line or cable. Additionally, oralternatively, it may be possible to use a same display for displayingthe image data on a screen or alternatively displaying measurementresults on the same screen. However, a switch may be also used forsimply switching on or off the image capturing device.

In a possible embodiment, the probe comprises a lamp. The lamp may beadapted to illuminate at least the area around the probe tip.

The lamp may be, for example, a light-emitting diode (LED). However, anyother appropriate light-emitting element may be also possible. Byilluminating the area around the probe tip, images can be even capturedin dark areas of an electronic circuit.

In a possible embodiment of the measuring system, the measuring systemcomprises a visualization device. The visualization device may beconfigured to display image data received by the image receivinginterface.

The visualization device may be any appropriate device for displaying ata received image data. For example, the visualization device may be adisplay such as a screen. In particular, the visualization device may bea display of a measurement device, which can be also used for displayingmeasurement results. Some further examples of visualization devices willbe described in more detail below.

In a possible embodiment, the visualization device comprises augmentedreality glasses.

Augmented reality glasses may provide semitransparent images.Accordingly, the images provided by the semitransparent glasses can berecognized together with the real environment. For example, it may bepossible to provide enhanced image data on the augmented realityglasses, which can assist a user when positioning the probe tip on ameasuring point. For example, a zoomed image may be provided in theglasses, and a user can recognize the zoomed segment together with thereal part of the electronic device.

In a possible embodiment, the visualization device is adapted to providea three-dimensional representation of the image data received by theimage receiving interface.

The three-dimensional representation may be provided by glasses fordisplaying three-dimensional content. Alternatively, it may be alsopossible to use any other appropriate technique for displayingthree-dimensional content, for example a display screen dealing withpolarized light or the like. Accordingly, by providing athree-dimensional representation of the area where the probe tip ismoving, the user can be assisted by positioning the probe tip on ameasuring point.

In a possible embodiment, the visualization device is adapted toselectively display either the image data received by the imagereceiving interface or measurement data of a signal measured at themeasuring point.

In this way, a same display can be used for displaying the image dataand for displaying the measurement results. Hence, the user may alwayslook at a same display during the positioning procedure and during thesuccessive measuring procedure.

In a possible embodiment, the measurement system comprises an opticalstabilizing device. The optical stabilizing device may be adapted tocompensate a shift in the captured image data, in particular a shift dueto unwanted movements of the probe.

The compensation of the shift may be compensated by shifting pixels inthe image data. Accordingly, the compensation of the shift is performedin an electronic way by data processing.

In a possible embodiment, the measuring system comprises a mechanicalstabilization device. The mechanical stabilizing device may be adaptedto mechanically equalize unwanted movements of the probe.

For example, the probe may be fixed to the mechanical stabilizing devicesuch that the mechanical stabilizing device may control the movement ofthe probe, in particular the probe tip. For example, the mechanicalstabilizing device may have a number of one, two, three or even moreaxis, which can be controlled. In particular, acceleration, tilt, or anyother movement may be detected. For example, the mechanical stabilizingdevice may have an acceleration sensor or the like for detectingunwanted movements.

In a possible embodiment, the method for applying the probe may furthercomprise a step of receiving the transmitted image data. In particularthe reception may be performed by an image receiving interface. Themethod may further comprise a step of displaying the image data receivedby the image receiving device. The image data may be displayed on avisualization device. The visualization device may be located at aspatial position remote to the measuring point.

With the present invention it is therefore now possible to assist a userwhen moving a probe tip in order to precisely position a probe tip at asmall sized measuring point. By capturing image data of the probe tip bymeans of a camera which is mounted in a fixed position of the probe, itis possible to capture image data of an area surrounding the probe tipand providing the captured image data to a user. In particular, theimage data may be provided in a magnified form such that a user caneasily recognize the detailed position of the probe tip with respect tothe desired measuring point. In this way, the positioning procedure of aprobe tip on a measuring point can be simplified. The images due to anunwanted movement of the probe tip can be avoided and a probability ofshort circuits or the like during the measurement procedure can bereduced.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present invention andadvantages thereof, reference is now made to the following descriptionin conjunction with the accompanying drawings. The invention isexplained in more detail below using exemplary embodiments, which arespecified in the schematic figures of the drawings, in which:

FIG. 1: shows a schematic diagram of a probe according to an embodiment;

FIG. 2: shows a schematic diagram of another embodiment of a probe;

FIG. 3: shows a schematic diagram of still another embodiment of aprobe;

FIG. 4: shows a schematic diagram of an embodiment of a measurementsystem;

FIG. 5: shows a schematic diagram of another embodiment of a measurementsystem; and

FIG. 6: shows a flow diagram of a method according to an embodiment ofthe present invention.

The appended drawings are intended to provide further understanding ofthe embodiments of the invention. They illustrate embodiments and, inconjunction with the description, help to explain principles andconcepts of the invention. Other embodiments and many of the advantagesmentioned become apparent in view of the drawings. The elements in thedrawings are not necessarily shown in scale.

In the drawings, same, functionally equivalent and identical operatingelements, features and components are provided with same reference signsin each case, unless stated otherwise.

DETAILED DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a schematic diagram of a probe 10 according to anembodiment. Probe 10 comprises at least a probe tip 11, an imagecapturing device 12 and an image transmission interface 13. Probe tip 11may be an electric conductive tip for contacting a measurement point.For example, the measurement point may be a pin of an integrated circuitor another contact point of an electronic circuit. However, it isunderstood that probe tip 11 may be also able to contact any otherappropriate measuring point of an electronic circuit. Probe 10 mayfurther comprise a port or a cable for electrically connecting probe tip11 with an input port of a measurement device.

Probe 10 further comprises the image capturing device 12. In particular,image capturing device 12 may be firmly attached to a housing of probe10. The field of view of image capturing device 12 may be directed toprobe tip 11. Accordingly, image capturing device 12 may capture imagesof an area surrounding probe tip 11. Thus, when probe 10 with probe tip11 is moving around on an electric circuit, image capturing device 12may capture an image of probe tip 11 and the related area of theelectric device. In this way, image capturing device 12 may captureimages from potential measuring points, which may be contacted by probetip 11.

Image capturing device 12 may be a camera for capturing image datarelated to visible wavelength. In particular, image capturing device 12may be a monochromatic or a colored camera for capturing image data.However, it may be also possible that image capturing device 12 maycapture infrared or ultraviolet wavelength.

Image capturing device 12 may have a fixed, predetermined field of viewrelated to a specific opening angle. However, it may be also possiblethat the field of view, in particular the opening angle of imagecapturing device 12 may be variable. Accordingly, the scale of zoom maybe changed, for example may be changed depending on a desiredapplication. For example, when dealing with very small sized devices,image capturing device 12 may capture a small field of view with a veryhigh resolution. Furthermore, when dealing with devices of a largerscale, a larger field of view with a lower resolution may be captured byimage capturing device 12. The field of view and consequently theresolution may be adapted either manually or automatically.

Image capturing device 12 may continuously capture images, and providethe captured images as a continuous sequence with a predetermined framerate. Alternatively, it may be also possible that image capturing device12 may only capture a single image upon request. For example, imagecapturing device 12 may be triggered by an automated or manuallyprovided trigger signal and provide a single image upon receiving thetrigger signal. However, any other approach for providing images may bealso possible.

Image capturing device 12 may provide the captured image data to imagetransmission interface 13, and image transmission interface 13 mayforward the image data to a corresponding remote device. Examples forsuch remote devices will be described in more detail below.

FIG. 2 shows a block diagram of a probe 10 according to a furtherembodiment. The embodiment according to FIG. 2 differs from thepreviously described embodiment in that the image capturing device 12comprises two image capturing elements 12-1 and 12-2. For example, thetwo image capturing elements 12-1 and 12-2 may be image capturingelements of a dual camera or a stereo camera. In case of a stereocamera, the two image capturing elements 12-1 and 12-2 capture images ofa common area from different points of view. In this way, it is possibleto obtain a three-dimensional view of the captured area.

Furthermore, it may be also possible that the two image capture elements12-1 and 12-2 are directed to different areas and/or the two imagecapturing elements 12-1 and 12-2 may have different opening angles. Forexample, a first image capturing element 12-1 may capture wide-angleimages, and a second image capturing element 12-2 may capture zoomimages with a smaller opening angle. Furthermore, it may be evenpossible to use more than two image capturing elements 12-1 and 12-2.

To illuminate the area covered by the one or more image capturingelements 12-i, a lamp 14 may be arranged on the probe 10. For example,the lamp may comprise one or more light-emitting diodes (LED) or anyother kind of light-emitting element. In particular, the emitted lightmay be directed in the direction of the probe tip 11.

Furthermore, probe 10 may comprise a switch (15) for switching between afirst operation mode for capturing image data by the image capturingelement 12 and a second mode for measuring signals by probe tip 11. Inparticular, the image capturing element 12 may be switched off in thesecond operation mode. However, it may be also possible to maintain theoperation of the image capturing element 12 when measuring the electricsignals by probe tip 11. In this way, it may be further possible tomonitor the correct position of the probe tip at the measuring pointduring the measurement.

FIG. 3 shows a block diagram of a further embodiment with a probe 10.Probe 10 in this embodiment mainly corresponds to the previouslydescribed probes 10 according to FIG. 1 or FIG. 2. Further, probe 10 maybe mounted on a mechanical stabilizing device 30. The mechanicalstabilizing device 30 may mechanical equalize an unwanted movement ofthe probe 10. For this purpose, the mechanical stabilizing device 30 maycomprise one or more controllable axis for moving or rotating probe 10.In this way, the spatial position of probe 10 with the probe tip 11 maybe spatially stabilized. For example, a gyroscope or an accelerationsensor or the like may be used for detecting a movement. Upon detectingan unwanted movement, the mechanical stabilizing device 30 may provide acontrolled reaction for compensating such an unwanted movement.

Furthermore, the image data provided by image capturing device 12 may beanalyzed in order to detect a movement of probe 10 and in response tosuch a detection of an unwanted movement, mechanical stabilizing device30 may provide an appropriate response for compensating such an unwantedmovement.

Additionally, or alternatively, the image data provided by imagecapturing device 12 may be also compensated in order to obtain astabilized image. For this purpose, pixels in the image data may beshifted to compensate unwanted movement in a resulting image. In thisway, the image data may be processed in order to obtain stabilized imagedata.

FIG. 4 shows a block diagram of a measurement system according to anembodiment. The measurement system comprises a probe 10, for example aprobe 10 as described above in connection with FIG. 1 to FIG. 3. Probe10 may be connected to a measuring apparatus 20. For example, probe 10may be connected to measuring apparatus 20 by means of a cable. Inparticular, a single cable may be used for connecting probe 10 andmeasuring apparatus 20. However, it may be also possible to use separatecables for connecting the probe tip 11 with measuring apparatus 12 andfor connecting the image transmission interface 13 with a correspondingimage receiving device 23 of the measuring apparatus 20.

Image receiving device 23 of measuring apparatus 20 may receive theimage data provided by image transmission interface 13. The receivedimage data may be processed and displayed on an appropriate display 21of measuring apparatus 20. For example, a same display 21 may be usedfor displaying measurement results and for displaying the image dataprovided by image capturing device 12. For this purpose, it may bepossible to switch between an image capturing mode for displaying theimage data and a measuring mode for displaying the measurement results.Furthermore, it may be possible to provide the measurement results andthe image data simultaneously. For example, a picture in pictureconfiguration may be used, or the screen may be split for displaying themeasurement results in a first part of the screen and displaying theimage data in a second part of the screen. However, any otherconfiguration of the screen may be also possible for providing imagedata and/or measurement results.

FIG. 5 shows a block diagram of a measurement apparatus according to afurther embodiment. The measurement system according to FIG. 5 mainlycorresponds to the previously described measurement signal according toFIG. 4. The measurement signal according to FIG. 5 differs from thepreviously described measurement signal by a separate visualizationdevice 22. For example, visualization device 22 may comprise avisualization device for a three-dimensional visualization of imagedata, in particular of image data provided by a stereo camera of a probe10. For example, visualization device 20 may comprise glasses, inparticular augmented reality glasses or virtual reality glasses forproviding separate image content for each eye of a user. However, it maybe also possible to provide the image content on any other kind ofvisualization device, in particular any kind of display such as atwo-dimensional display or a display for providing three-dimensionalimage content.

FIG. 6 shows a block diagram of a method for applying a probe at ameasurement point. In a step S1 image data are captured of an areaaround a probe tip 11 of a probe 10 by an image capturing device 12arranged at the probe 10. In a step S2 the captured image data aretransmitted to a remote measuring apparatus 20 by an image transmissioninterface 13 of the probe 12.

Furthermore, in a step S3 the transmitted image data may be received byan image receiving interface 23, and in a step S4 the received imagedata may be displayed at a visualization device 21, 22, which isarranged to remote to a measuring point.

Summarizing, the present invention relates to an improved probe forprecisely positioning a probe tip at a measurement point. For thispurpose, an image capturing device such as a camera may be firmlyarranged at the probe. The image capturing device may capture image dataaround an area of the probe tip. The captured image data may be providedto a user during positioning the probe tip at the desired measuringpoint.

Although the present invention has been described in the above by way ofpreferred embodiments, it is not limited thereto, but rather can bemodified in a wide range of ways. In particular, the invention can bechanged or modified in various ways without deviating from the core ofthe invention.

What we claim is:
 1. A probe for measuring a signal at a measuringpoint, the probe comprising: a probe tip adapted to contact a measuringpoint for measuring an electric signal; an image capturing deviceadapted to capture image data of the probe tip and an area around theprobe tip; and an image transmission interface adapted to transmit thecaptured image data to a remote measuring apparatus, wherein the imagecapturing device comprises multiple optical systems directed todifferent target points, each of the multiple optical systems havingdifferent optical properties; and further comprising a switch which isadapted to switch between an image capturing mode and a signal measuringmode, wherein a same signal line or cable is used for transmitting thecaptured image data in the image capturing mode and for transmitting ameasurement signal of the measured electric signal in the signalmeasurement mode.
 2. The probe of claim 1, wherein the image capturingdevice is adapted to simultaneously capture wide-angle images and zoomimages.
 3. The probe of claim 1, wherein the image capturing device isadapted to provide still images.
 4. The probe of claim 1, wherein theimage capturing device is adapted to provide an image sequence.
 5. Theprobe of claim 1, further comprising a lamp which is adapted toilluminate at least the area around the probe tip.
 6. A measuringsystem, the measuring system comprising: a probe for measuring a signalat a measuring point, a measuring apparatus remote from the probe, aswitch which is adapted to switch between an image capturing mode and asignal measuring mode the probe comprising: a probe tip adapted tocontact a measuring point for measuring an electric signal; an imagecapturing device adapted to capture image data of the probe tip and anarea around the probe tip, wherein the image capturing device comprisesmultiple optical systems directed to a same target point, each of themultiple optical systems having different optical properties; an imagetransmission interface adapted to transmit the captured image data tothe measuring apparatus remote from the probe; and wherein a same signalline or cable is used for transmitting the captured image data in theimage capturing mode and for transmitting a measurement signal of themeasured electric signal in the signal measurement mode; and wherein themeasuring apparatus remote from the probe comprising an image receivinginterface adapted to receive the image data transmitted by the imagetransmission interface of the probe.
 7. The measuring system of claim 6,further comprising a visualization device adapted to display the imagedata received by the image receiving interface.
 8. The measuring systemof claim 7, wherein the visualization device comprises augmented realityglasses.
 9. The measuring system of claim 7, wherein the visualizationdevice is adapted to provide a three-dimensional representation of theimage data received by the image receiving interface.
 10. The measuringsystem of claim 7, wherein the visualization device is adapted toselectively display either the image data received by the imagereceiving interface or measurement data of a signal measured at themeasuring point.
 11. The measuring system of claim 6, further comprisinga mechanically stabilizing device adapted to mechanical equalizeunwanted movement of the probe.
 12. A method for applying of a probe ata measuring point, the probe comprising a probe tip for measuring anelectric signal, the method comprising the steps of: capturing imagedata of the probe tip and an area around the probe tip by an imagecapturing device arranged at the probe, wherein the image capturingdevice comprises multiple optical systems directed to different targetpoints, each of the multiple optical systems having different opticalproperties and further comprising a switch which is adapted to switchbetween an image capturing mode and a signal measuring mode; andtransmitting the captured image data to a remote measuring apparatus byan image transmission interface of the probe, wherein a same signal lineor cable is used for transmitting the captured image data in the imagecapturing mode and for transmitting a measurement signal of the measuredelectric signal in the signal measurement mode.
 13. The method of claim12, further comprising: receiving the transmitted image data by an imagereceiving interface.
 14. The method of claim 13, further comprising:displaying received the image data by a visualization device remote tothe measuring point.